Both SAR and Chinook have ex-AAC or exchange pilots, suggest you talk directly to the 7 Sqn exchange bod, or the ex-AAC QHI on SAR.
Bit of a AAC mafia starting to form at the secret Wiltshire base, both 'K' and 'J' would be good place to start flying multi's,and it seems that ab-initios will now be on the 'J' OCU.
Before you get too excited (!), talk to Innsworth, see if it's a starter, dont burn your rickety bridge yet!